Fluid delivery system



Nov. 26, 1963 c. R. WATERMAN FLUID DELIVERY SYSTEM Filed June 19, 1962 United States Patent Ofifice artists Patented Nov. 26, 1963 3,111,903 FLUID DELIVERY SYSTEM Carl R. Waterman, Holmes Road, West Scarhoro, Maine Filed June 19, 1962, Ser. No. 203,517 1 Claim. (Cl. 103-13) The present invention relates to a fluid delivery system generally and in particular to a fuel oil delivery system.

An object of the present invention is to provide a fluid delivery system for use with a fuel oil truck whereby the throttle of the trucks engine is controlled by the pressure of the fuel as it is delivered to a customers tank.

Another object of the present invention is to provide a fluid delivery system for use with a fuel oil truck or gasoline delivery truck, one which is automatic in operation, one which is foolproof in operation, and one which is novel in conception, and one which is highly effective in action.

These and other objects and advantages of the present invention will be fully apparent from the following description when taken in connection with the annexed drawings, in which:

FIGURE 1 is a view of the control device with the cover partially broken away,

FIGURE 2 is an elevational view of the solenoid por-- tion of the device showing its attachment to the engine control rod, the control rod being partially broken away, and

FIGURE 3 is a schematic view showing the circuit of the present device and showing schematically the attachment of the solenoid to the engine control rod.

With reference to the drawing in detail, the present invention provides a casing 16 having a cover 12 thereon, the cover being shown broken away. A truck engine is shown schematically in FIGURE 3 and designated by the reference numeral 14, the engine including a pump 16.

The engine 14 has a throttle control rod 18 and a solenoid 20 is provided by the present invention operatively connected to the control rod 18 so as to increase the speed of the engine 14 upon energization of the solenoid 20'.

The arm 22 of the solenoid 28 is connected by a flexible chain 24 to the control rod 18 with a clamp 26 adjustably positioned upon the control rod 18.

The present invention provides a first pressure sensitive normally closed valve 28 connecting in communication with a conduit 36 which is connected in communication with the pump 16. The switch 28 is set so as to open upon a predetermined pressure such as sixty pounds per square inch.

The present invention provides a second pressure sensitive normally closed switch 32 which is adapted to open at a predetermined pressure less than the pressure at which the switch 28 operates. For instance the switch 32 operates to open position at fifteen pounds per square inch. The switch 32 is also connected in communication with the conduit 30.

A relay switch 34 is provided in shunt connection with respect to the switch 32. As shown in FIGURE 3, the relay switch 34 is in series connection with the switch 28, with the solenoid 2d, and with a battery 36 as a source of energy.

Also in circuit with the switch 25 and the battery 36 is a normally open pressure sensitive switch 38 which is operable to close upon a very slight pressure in the conduit 3G to which it is also connected. For instance three pounds per square inch will serve to close the switch 38.

The present invention also provides a manually operable switch 40, this switch 4t} being in circuit with the switch 38 and the switch 28 as shown most clearly in FIGURE 3.

An indicator light 42 is provided to show when the switch 38 is in closed position.

In the preferred embodiment of the present invention the casing 10 is attached to the delivery truck in a position convenient to the operator. The switch 28 is connected by a short length of conduit 44 to the conduit 30 with a cross connector 46 serving to distribute the pressure through another conduit 48 to the switch 32 and conduit Bil to the switch 38.

in operation, the delivery truck operator engages the pump 16 with engine 14 running. This provides pressure in the conduit 39 so that switch 3-55 shifts to closed position and indicator light 42 comes on indicating unit is ready to function. Pressure in conduit 48 also opens normally closed switch 32. Switch it! can now be turned on. After operator has unreeled hose to reach tank to which delivery of the liquid is to be made he opens the nozzle which serves to drop the pressure in conduit 36 so that switch 32 closes energizing solenoid 2t} and also energizing coil relay 34. Energizing coil relay 34, closes contacts 52 and 54 which serves to by-pass switch 32. Contacts 52 and 54 also serve to connect a line that is a holding circuit for coil relay 34. When solenoid 20 is energized, control rod 18 is pulled back to speed up engine 14 which speeds up pump 16. This increases the pressure in conduit 30 and causes switch 32 to open. This increase in pressure will not be so high as to open switch 28. Switch 28 will remain closed carrying the electric force to keep energized solenoid 2% through the closed contacts 52 and 54.

When the nozzle is closed the pressure in conduit 30 will rise, causing switch 2% to open. Opening of switch 28 causes relay 34 to de-energize opening contacts 52 and 54 and also de-energizes solenoid 20 and engine 14 will return to idling speed.

With the nozzle closed, engine idling speed will cause pump 16 to deliver suificien-t pressure through conduit 34) to hold switch 32 open. Engine will remain at idle until nozzle is opened.

It will be seen therefore that the system of the present invention is automatic and foolproof in operation, once the nozzle is opened for delivery of the fuel the engine 14 will be speeded up so that the pump operates at a high rate of speed to quickly and efliciently deliver the fuel to the tank of the customer.

While only a preferred embodiment of the present invention is shown and described, other embodiments are contemplated and numerous changes and modifications may be made therein without departing from the spirit of the invention as set forth in the appended claim.

What is claimed is:

In a fluid delivery system, an engine having a reciprocable throttle control rod, a fluid pump driven by the engine, a conduit connected in communication with said pump, a first pressure sensitive normally closed switch connected in communication with said conduit and adapted to open at a predetermined pressure, a second pressure sensitive normally closed switch connected in communication with said conduit and adapted to open at another predetermined pressure less than the first mentioned predetermined pressure, a solenoid drivably connected to said control rod so as to increase t e speed of said engine when energized, said first and second switches being series connected with said solenoid and a source of current, and a relay switch in shunt connection with said second switch and in series connection with said first switch and said solenoid.

References (iited in the file of this patent UNITED STATES PATENTS Claytor Apr. 2, 1946 Mat hews Sept. 8, 1953 Mathews Sept. 8, 1953 Nahmens Sept. 15, 1953 Lazzereschi June 25, 1957 

